Portable blowup underpinning for trailers



FIG. 1 is a side perspective view of a portable blowup underpinning in a deflated state showing my new design;

FIG. 2 is a rear perspective view thereof in a partially inflated state;

FIG. 3 is a rear perspective view thereof in the partially inflated state;

FIG. 4 is a side perspective view thereof in a fully inflated state;

FIG. 5 is a front perspective view thereof in the fully inflated state;

FIG. 6 is a zoomed in view of a portion of the portable blowup underpinning in the deflated state including an air compressor;

FIG. 7 is a zoomed in view of a portion of the portable blowup underpinning in the fully inflated state including the air compressor;

FIG. 8 is a side perspective view of the portable blowup underpinning including a plurality of trailer securing devices;

FIG. 9 is a zoomed in view of a portion of the portable blowup underpinning including a storage portion;

FIG. 10 is a side perspective view of the portable blowup underpinning including the plurality of trailer securing devices; and,

FIG. 11 is a bottom perspective view thereof.

Broken lines are for illustrative purposes only, and form no part of the claimed design. 

CLAIM The ornamental design for a portable blowup underpinning for trailers, as shown and described. 